Currently the collection's MUPWJ documentation comes solely from Howard Hallman's office. Both paper and digital born records illustrate how MUPWJ started out as a small, volunteer group of United Methodist clergy and laity to give voice against nuclear weapons and support the idea of mutual destruction deterrence. The records show how Hallman's drive to make a larger coalition amongst other religious bodies and then like-minded nonprofit, non-governmental organizations that share MUPWJ core values in order to create a more unified strong voice for justice and peace in the world.

The records show how far reaching MUPWJ and its coalition organizations cajoled, lobbied and confronted from lowest to the highest levels of government in order to halt nuclear testing, end nuclear deterrence policies and chemical weapons development and their usage. The Comprehensive Nuclear Test Ban Treaty (CTBT) and Non-Proliferation Treaty ratifications make up a majority of the records going into and beyond the 21st century. There are also documents related to stopping the spread of nuclear weapons expansion in non-nuclear countries with India and Pakistan serving as case tests. Additionally, there are emails discussing the ratification of the Chemical Weapons Convention.

Further documents record how MUPWJ took an active role in trying to block any American military activity in Afghanistan and the Gulf region as it continued to escalate under various presidential administrations. Once war became inevitable, MUPWJ called for quick endings to all fighting with just resolutions. They augmented their antiwar stance in order to achieve a sustainable peace by lobbying the United States government and other first world powers through coalition building of like-minded groups by lobbying both in personal visits and writing government leaders.

By 2004, documents show there was a series of conferences, recommended publications, outreach programming to local church study groups and other venues to discuss the idea of a theologically just war concept in light of theological pacifism. As a result the subsequent discussions and advocation of peace were filtered through Albert Outler's intellectual Wesleyan Quadrilateral of four theological categories: Scripture, Tradition, Reason and Experience in order to create a deeper and more relevant theological construct to change or reject the idea of a just war. As typical of Hallman's leadership, the conversation ranged across a broad spectrum led by ideas from prominent scholars representing related disciplines and multi-denominational peace statements. Also documented is how in the late 1980s MUPWJ took up the cause to end the Reagan era Star Wars Strategic Defense Initiative as part of its larger anti-nuclear proliferation goal.

Peace Leaf, along with the shorter Peace/Justice Alert are the official MUPWJ publications. Letter and later email campaigns to Methodist Church leaders, domestic and foreign political officials and staffs, various forms of news outlets, local church programs, special events and a robust website enabled MUPWJ to further its mission.

There are complete manuscripts and supporting documents of Hallman’s personal writings and subsequent submissions to various agents or publishers.